Load Dispersing Member for Electrical Box Cover Hinge Stress
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Solution Overview
Problem
Conventional while-in-use electrical box covers experience high stress and failure due to torque loads when opened, leading to damage and unusability, as they lack effective stress distribution mechanisms at the hinge areas.
Innovation Solution
Incorporation of load dispersing members with complementary contact surfaces on the hood and base, which engage to distribute stress away from the hinge mounts, preventing knife-edge contact and enhancing the structural integrity of the cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional while-in-use electrical box covers are used without load dispersing members, then the structure is simple and easy to manufacture, but the cover experiences high stress concentration at hinge areas leading to failure under torque loads
Solution Approach 1:
The load dispersing member is divided into multiple contact surfaces (first contact surface and second contact surface) that engage with corresponding surfaces on the hood and base. This segmentation distributes the torque load across multiple discrete contact points rather than concentrating it at a single hinge mount location, thereby reducing stress concentration while maintaining manufacturing simplicity.
Solution Approach 2:
The load dispersing member is strategically positioned at the hinge area where stress concentration occurs. By adding this localized component with complementary contact surfaces, the patent improves stress resistance precisely where needed without requiring a complete redesign of the entire cover structure, thus minimizing the increase in device complexity.
2Reliability
If load dispersing members with contact surfaces are added to engage and distribute stress, then the stress distribution and structural integrity are improved, but the device complexity increases
Solution Approach 1:
The load dispersing member is integrated with the electrical box cover assembly such that it becomes a unified structure. The member engages with existing hinge mounts and contact surfaces, merging its stress-distributing function into the overall cover system rather than operating as a completely separate component, thereby improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The load dispersing member serves multiple functions: it distributes torque loads across contact surfaces, prevents knife-edge contact at hinge mounts, and enhances overall structural integrity. By consolidating these multiple functions into a single component, the patent improves reliability without requiring multiple separate parts, thus limiting the increase in device complexity.
Data Source
AI summary
A while-in-use electrical box cover includes a base and a hood. The base has a box-like structure and an open front face and includes a base hinge mount. The hood has a front wall for covering the open front face of the base and includes a hood hinge mount. A hinge pin joins the base hinge mount and the hood hinge mount in a pivoting configuration. An accepting member including a first contact surface extends from the base hinge mount. A load dispersing member included on the hood has a second contact surface configured to engage the first contact surface when the hood pivots to a fully open position. Engagement of the first contact surface and the second contact surface creates a stress in the hood, and the load dispersing member disperses the stress away from the hood hinge mount.